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High-strength hardwood pulp and preparation method thereof

A high-strength, broad-leaf technology, applied in pulp bleaching, digesters, textiles and papermaking, etc., can solve the problems that hardwood pulp cannot meet market demand, achieve the effect of optimizing wood pulp performance and improving tensile index

Inactive Publication Date: 2018-12-11
HAINAN JINHAI PULP & PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, with the rapid development of my country's paper industry, the requirements for cardboard strength are getting higher and higher, but the existing hardwood pulp cannot meet the market demand

Method used

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  • High-strength hardwood pulp and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A high-strength hardwood wood pulp, the raw wood of which is composed of the following raw materials in mass percentage: 90% of blue eucalyptus and 10% of Vietnamese acacia.

[0023] The preparation method of above-mentioned high-strength hardwood wood pulp, comprises the following steps:

[0024] S1. Cooking: Cook the blue eucalyptus and Vietnamese acacia wood chips at 150°C according to the above mass percentage, the amount of alkali used is 15% of the total mass of the blue eucalyptus and acacia wood, the pressure is 5 Bar, and the cooking time is 5 hours;

[0025] S2. Screening: the combination of hole screen and slot screen, the aperture is 0.4mm;

[0026] S3. Oxygen bleaching: temperature 110°C, pressure 6Bar, NaOH dosage 20Kg / ADT, oxygen dosage 24Kg / ADT, slurry mass concentration 10%;

[0027] S4, bleaching:

[0028] ①The first chlorine dioxide bleaching: chlorine dioxide dosage 10Kg / ADT, 75°C, pH 2.5, 50min, normal pressure;

[0029] ②Alkaline extraction: NaO...

Embodiment 2

[0033] A high-strength hardwood wood pulp, the raw wood of which is composed of the following raw materials in mass percentage: 70% of blue eucalyptus and 30% of Vietnamese acacia.

[0034] The preparation method of above-mentioned high-strength hardwood wood pulp, comprises the following steps:

[0035] S1. Cooking: Cook the blue eucalyptus and Vietnamese acacia wood chips at 150°C according to the above mass percentage, the amount of alkali used is 15% of the total mass of the blue eucalyptus and acacia wood, the pressure is 5 Bar, and the cooking time is 5 hours;

[0036] S2. Screening: the combination of hole screen and slot screen, the aperture is 0.4mm;

[0037] S3. Oxygen bleaching: temperature 110°C, pressure 6Bar, NaOH dosage 21Kg / ADT, oxygen dosage 24Kg / ADT, slurry mass concentration 10%;

[0038] S4, bleaching:

[0039] ①The first chlorine dioxide bleaching: chlorine dioxide dosage 10Kg / ADT, 75°C, pH 2.5, 60min, normal pressure;

[0040] ② Alkaline extraction: Na...

Embodiment 3

[0044] A high-strength hardwood wood pulp, the raw wood of which is composed of the following raw materials in mass percentage: 80% of blue eucalyptus and 20% of Vietnamese acacia.

[0045] The preparation method of above-mentioned high-strength hardwood wood pulp, comprises the following steps:

[0046] S1. Cooking: Cook the blue eucalyptus and Vietnamese acacia wood chips at 150°C according to the above mass percentage, the amount of alkali used is 15% of the total mass of the blue eucalyptus and acacia wood, the pressure is 5 Bar, and the cooking time is 5 hours;

[0047] S2. Screening: the combination of hole screen and slot screen, the aperture is 0.4mm;

[0048] S3. Oxygen bleaching: temperature 110°C, pressure 6Bar, NaOH dosage 21Kg / ADT, oxygen dosage 24Kg / ADT, slurry mass concentration 10%;

[0049] S4, bleaching:

[0050] ①The first chlorine dioxide bleaching: chlorine dioxide dosage 10Kg / ADT, 75°C, pH 2.5, 60min, normal pressure;

[0051] ②Alkaline extraction: NaO...

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Abstract

The invention provides high-strength hardwood pulp and a preparation method thereof. Raw material wood of the hardwood pulp comprises the following raw materials in percentage by mass: 70-90% of bluegum and 10-30% of acacia mangium. According to the high-strength hardwood pulp and the preparation method thereof, the blue gum and the acacia mangium are combined, a ratio of the blue gum to the acacia mangium is optimized, a tensile index, a tearing index and a burst index of the prepared hardwood pulp are greatly improved, and the hardwood pulp performance is significantly optimized, exceeds those of domestic conventional wood chip pulp, is above superior product standards in bleached hardwood pulp industry standards and is better than those of imported high-quality high-strength wood pulp.

Description

technical field [0001] The invention relates to the field of wood pulp, in particular to a high-strength hardwood wood pulp and a preparation method thereof. Background technique [0002] The paper industry is an important basic raw material industry closely related to the development of the national economy and social undertakings. The consumption level of paper and cardboard is a symbol to measure the level of modernization and civilization of a country. my country is a big producer and consumer of paper and paper products. The raw material of hardwood pulp is that the fiber of broadleaf wood is short, the content of lignin is low, the content of miscellaneous cells is small, and the growth cycle is short. It is the main tree species for the integrated construction of forestry, pulp and paper in my country. . In recent years, with the rapid development of my country's paper industry, the requirements for cardboard strength are getting higher and higher, but the existing h...

Claims

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Application Information

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IPC IPC(8): D21C7/00D21C9/14
Inventor 李树木郭彩虹唐雄群鲍坤
Owner HAINAN JINHAI PULP & PAPER
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